I started this project because my Panasonic AE700u had a 12v trigger output for a projector screen and because there was no place to hang a screen on the wall. One end of the living room in our 1863 cottage had a doorway and the other had a 6' tall window in the middle with a12' ceiling . So I built the device below to make the screen rise up from below instead.
The screen is driven by an AC motor and has a separate cord going to my electronics rack.
Relays turn the motor on and reverse the polarity for up and down.
Limit switches turn it off when fully extended or retracted.
Halfway through the project I upgraded to a Panasonic AX100. Turns out that the AX100 did not have a 12v trigger, so I got a wall transformer/charger and plugged it into a switched outlet on my entertainment rack. Now when I turn on the entertainment rack the screen raises and when I turn it off, it lowers to a hidden location in the credenza device. A switch on the end disables the screen when the stereo is playing music.
Caution, if you have a Panasonic AE700 and want the screen activated by the projector, then you have to build this additional circuitry described in the following post in order to drive the relays that run the screen up and down. The output from the Panny will not drive the relays. I built it and it works.
1) Under construction :
Lincoln Towncar seatback aparatus driven by refrigerator motor (right edge)
raises arm attached to scissor-like screen supports.
File drawer tracks on bottom allow support bottoms to come together as they
2) White projector screen lies on desk prior to mounting upside-down
on device. Screen is rolled backwards to limit width of opening in top of device.
Closet door roller track then riveted to the screen's pull tube and painted black.
Roller cars with white wheels then attached to top ends of supports.
3) Apparatus front is covered by a 10" plank. Legs and trim added, painted and installed against the living room wall. 4" Slot at front edge of table provides access to screen.
4) Stereo system started by remote, screen begins to rise.
5) Screen continues to rise to 4 1/2 feet tall.
6 ) Watching King Kong from about 14 feet away. You can faintly see the device below.
6 ) Watching Wind.
Wife approves of "Monster Screen" (her words)!!
Started out with DA-Lite high contrast and Moved to a 1.5 Da-Lite when I upgraded to the AX100. A 2.5 High Output will arrive today.
Not sure where to post this so maybe I'll put it in some other forums here.
Edited by pmacafee - 2/16/13 at 5:41am